Some of the HTML5 themes are designed to fill the entire width of the
browser window. To change the width of the theme, you will need to
edit the site's default.css file.
Typically, the style that you will want to edit is the #mainContainer
style. ...

Normally, emails sent from your store will be shown to the recipients
as coming from the full email address (i.e. email@domain.com).
However, it is possible to change the format of the email so that it
uses a display name alongside the email addres...

Yes!
If you are using 3dcart's RECURRING ORDERS
[https://support.3dcart.com/Knowledgebase/Article/View/628] add-on
(a.k.a. Autoship), your users with recurring orders may change the
date and frequency of the recurring orders themselves by using the...

If you would like to use Pay with Amazon, and have previously made
customizations to your store's view_cart.html template, you will need
to consider the following two options in order to have the Pay with
Amazon function appear on your checkout page....

This article will show you how to integrate PayPal Express Checkout
into your 3dcart store.
NOTE
PayPal Express is automatically enabled when using PAYPAL PAYMENTS
PRO [https://support.3dcart.com/Knowledgebase/Article/View/8], and
PAYPAL (POWERED ...